Gets or sets a value specifying whether an event was handled and that the default element painting is therefore not required.
true, if the default element painting is not required; otherwise, false.
If custom drawing is implemented and the Handled property value remains set to false, all the custom drawing performed will be overwritten by the default painting mechanism using the appearance settings. These appearance settings are specified by the CustomDrawEventArgs.Appearance property.
Set the Handled property to true to prevent the default painting mechanism from clearing any custom drawing after a custom draw event handler has been completed.
The CustomDrawEventArgs.DefaultDraw method, when called, automatically sets the Handled property to true.